818886656 has 72 divisors (see below), whose sum is σ = 1879146360. Its totient is φ = 349483008.

The previous prime is 818886637. The next prime is 818886661. The reversal of 818886656 is 656688818.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3426185 + ... + 3426423.

It is an arithmetic number, because the mean of its divisors is an integer number (26099255).

Almost surely, 2^818886656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818886656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (939573180).

818886656 is an abundant number, since it is smaller than the sum of its proper divisors (1060259704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

818886656 is an frugal number, since it uses more digits than its factorization.

818886656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 248 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 56.

The square root of 818886656 is about 28616.1956940471. The cubic root of 818886656 is about 935.5663610904.

Multiplying 818886656 by its sum of digits (56), we get a square (45857652736 = 214144²).

818886656 divided by its sum of digits (56) gives a square (14622976 = 3824²).

The spelling of 818886656 in words is "eight hundred eighteen million, eight hundred eighty-six thousand, six hundred fifty-six".